Jacketed conduit



Patented May 20, 19,24.

UNITED STATES PATENT OFFICE.

JAUKETED UOHDUIT.

Application med July 1l, 1621. Inria! lo. 456,718.

To all 'whom it may concern.'

Be it known that I, FRANK A. BRowNE, a citizen of the United States, residin in Wa ne, in the county of Delaware and tate of ennsylvania, have invented certain new and useful Improvements in J acketed Conduits, whereof the following is a specification, reference being had to the accompanyin drawings.

y invention relates to conduits or conduit systems useful in conducting substances or compounds which require constant application of heat to maintain them in a fluid condition, such for example as tar, pitch, as-

phalt, and the like.

Conduits of the kind referred to ordinarily take the form of a double pipe, or, in other words, comprise two pipes, one disposed centrally within the other, with Sufficient interspace between the two to afford an annular assage through which a suitable heating medium like steam or hot water may be circulated to prevent coagulation of the material as it is passed, under pressure, throu 'h the inner of the two pipes. In large manu acturing plants where highly viscous substances are to be transferred considerable distances, the j acketed conduits must of necessity be made up of a number of interconnected sectional lengths or units. Considerable difficulty has en experienced in maintaining the joints between units of such a system liquid ti ht on account of uneven linear expension etween the inner and outer pipes.

The primary object of my invention is to overcome the diiliculty just pointed out and this without necessitating use of stuiling boxes and the like. It is also my aim to Secure utmost simplicity in the construction of -acketed conduits so that they may be installed with greater ease than heretofore possible and prove less liable to derangement in long continued usage.

Other objects and attendant advantages of m invention will become apparent from the etailed description which follows Referrin to the drawings, Fig. I is an elevation o a portion of a sectional jacketed conduit system conveniently em ying my invention in one form.

Fig. II is an illustration showing, in elevation and partly broken away, the sections or units of the conduit and also portions of adjacent units partly one of system to set jacketing pipes 6 have their kforth certain important details to better advantage.

Fig. III is an end as viewed from the Fig. IV is an axia form of my invention.

Fig. V is an axial sectional view of a coupling more especially adapted to be used between the Sectio` al units of the conduit system and Figs. VI and VII are, respectively, an axial sectional view, and a cross section of another modified form of my invention.

Referrin first to the embodiment of m invention shown in Figs. I, II and III, the conduit System is there re resented as comrehending .a number of) sectional` units.

ome of these units are straight as indicated at 1, 1, and others curved as shown at 2, 2, the iatter serving, collectively, to form an upturned bend 3 for allowing general linear expansion of the system. It is of course to understood that, when required, several such bends ma be interposed in the System, the number epending entirely u on the length of the conduit. As suggeste to best advantage in Fi II, the conduit units (both straight ang curved), comprise an inner pipe 5 for conducting the viscous matter, and which is disposed concentrically within a larger or jacketing pipe 6 with interposition of an annular interspace 7 between the two for circulation of a Huid heating medium. The ends of the pipes 5 and 6 are referably secured, by means of screw threa ing, in cou ling elements 8, 8 which are fastened rigi ly together by clamping bolts 9, 9. The inner pipes 5 are let into suitable apertures in internal flanges 10, 10 of the elements ,-8 and have their contiguons ends substantial] abutting in the plane of meeting of said e The outer or ends let into flanges 11, 11

elevation of the conduit ri ht of Fig. II.

Section of a modified ements.

integral axial extensions or of the couplin ticularly note that they terminate Short of the ends of the pipes 5, so as to afford annular clearance spaces 12, 12. The clearance s ace 12 in one element 8 is connected to t e corres nding adjacent space in the fellow cou 1mg element through a by-pass pipe 13 whic unites radial ducts 14, 14 of sald elements leading directly from Said clearance spaces. In this way continuous comelements 8, and it is to be par-y munication is established between the interspaccs 7, 7 of the res tive sectional units of the conduit. The ucts 14, 14, it will be noted, are disposed at an angle to each other, preferably at y a quadrant as suggested in ig. III so that the fittings necessary to the installation of the pipes 13 may be assembled without incurring undue diiliculty. At a region intermediate its ends, preferably at the center, each of the outer or jacketing pipes 6 of the several conduit sections, is corrugated as at 15, 15. Said are ca able of yielding in compensating for local iferential linear expansion between the two pi es, and thus serve to obviate possibility o rupture or derangernent of the couplings.

Referringl now to Fig. IV, the modification there s own is useful in a capacity similar to that of the first embodiment although it is quite different in construction. In this instance, the outer pipes 6 of adjacent conduit units have secured to them, at their ends, flange members 20, 21. Interposed between said flange members is an insert element 22 which will be again referred to presently, and an expansion coupling comprising annular flange heads 23, 24, and a connecting sleeve 25. The pxarts 20, 22 and 23 are secured rigidly toget er by bolts 26, and the parts 21 an 24, by bolts 27. The outwardly turned annular terminal ends of the connecting sleeve 25 of the coupling are clamped between the opposing faces o the elements 22, 23 and 21, 2A respectively. Said sleeve has also a eripheral protuberance or corrugation 28 w ich yields in compensating for differential local expansion between the pipes 5 and 6 in precisely the same manner as described in connection with the first embodiment of my invention. The pretuberance or corrugation 28 is protected by appropriate shrouding anges 29, 29 of the heads 23 and 24. The inner pipes 5, 5, abut in the meeting plane of elements 20, 22 and are' screwed into axial apertures of internal Ilan es of said elements, as clearly shown in the illustration. Continuous communication between the interspaces 7, 7, intermediate the pi es 5 and 6 is established as before throng by-pass pi es (not shown) adapted to connect the ra ial ducts 30, in the parts 20 and 22.

The structure shown in Fig. V is intended for use as a substitute for, or as an auxiliary to, the bend 3 of Fig. I in absorbing general linear expansion of the conduit,-one or more of these devices bein employed at different points along the con uit as may be found necessary or desirable in ractice. In this organization, the inner an outer ipes 5 and 6 of the respective sections 1, 1 ave secured to their ends, liange elements 40, 40 which are identical to the elements 8, 8 of the first embodiment. Said flange Yelements corrugations o are united by a coupling indicated at 41 comprising flange heads 43, 43 joined by a sleeve 44 and respectively bolted to auxiliary face flange rings 45, 45, which, in turn, are bolted to the elements 40, 40. The sleeve 44 has corrugations 46 and is secured between the elements 43, 45 in a manner similar to that described in connection with the sleeve 25 of the tion of Fig. IV. con'unction with the axial shroud flanges f t e elements 43, 43 in protecting the corru ations of the explansion sleeve. The ra ial ducts 48 48 in t e elements 40, 40 are to be connected by a by-pass pipe which is suciently exible to permit ready expansion of the coupling.

Referring finally to the modied form of expansion coupling shown in Figs. VI and V I, the elements 50, 50 have annular protuberances 51, 51 which serve after the manner of corrugations to allow for differential linear expansion between the two constituent pipes of the conduit sections. As a further variation, the interspaces 7, 7 of the adjacent conduit sections are here shown as being directly connected by a flexible coupling pipe 52. The functioning of this modification is thought to be obvious in view of what has already been explained in connection with the other forms.

From the foregoing, it will be seen that although I have shown and described `m invention in diferent forms, that they al serve in the attainment of one and the same end, i. e., of compensating for both general and differential expansion between the inner and outer pipes of a double conduit system. The absence of stuiling boxes or similar appurtenances which have been resorted to in systems heretofore designed to serve in the same capacity asy m invention, precludes the puossibility of lea ing joints, as a result of w -ch the cost of maintenance and repair is eatly reduced.

aving thus described my invention, I claim:

1. A jacketed conduit system comprehending a number of sectional units consisting of two pipes, one disposed within the other; coupling devices for connectin the pipes continuousl together, said devices havin inter d in them corrugations capable o yielding to compensate for differential linear expansion between the pipes.

2. A jacketed conduit system constituted of a number of sectional units consistin of two pipes, one disposed within the ot er; couplin devices for connecting contiguous ends o the inner pipes directly together, and the jacketing pipes also but with interposition of corrugations capable of yielding comprehensively to compensate for dill'erential linear expansion between the two pipe sections.

3. A. jacketed conduit system comprehendmodifica- Anannulus 47 serves in lll in a number of sectional units each comprising two pipes, one disposed within the other; and couplings for connectin the conduit units togetherjin the form o abutting elements having a rtured flanges into which contiguous en s of the inner pipes are secured in direct continuity, and also corrugated axial extensions whereto the ends of the 'acketing pipes are secured.

4. T combination, of conduit units including inner and outer pipes in substantial concentric relation, and eouplingamembers between the sections connecting re ted Apipes to form a continuous jacketedconduit system, the coupling members including short sectlons of tubing corrugated to permit contraction and expansion of the system.

5. The combination, of conduit units in cluding inner and outer pi in substantial concentric relation, coupling members for connecting the pipes to form a continuous acketed conduit system, each cou ling memr including a corru ted tubu r section, and pairs of coupli anges for connecting the ends of the tubu ar section to the adjacent ends ofa pair of units between which the coupling member is interposed.

6. A coupling device for jacketed conduit stems, including a tubular corru ted sectlon, coupling members embracing said tubular section and 'adapted for coupling engagement to the ends of jacketed pipes, an shroudin ianges formin part of the coupling mem ers embracing te corrugated portions.

7. A coupling device for jacketed conduit systems, including a tubular section having multiple, corrugations, coupling members embracin the tubular section and adapted for coup ing enga ment to the adjacent ends of jacketed pipes, annular shrouding flanges forming part of the embracing elements to enclose the corrugations of the tubular section, and 'an annular protective member interposed between said shields and enclosing intervening corrugations of said tubular member.

8. The combination of conduit units, including inner pipes arranged in continuity, and outer pipes of lesser length, couplin members for connecting the inner pipes an including portions for bridging the space between the ends of the outer ipes, said bridging rtions including tubu ar sections corrugat to permit ex anson.

In testimony whereo I have hereunto signed my name at Philadelphia, Pennsylvania, this 8th da of Jul 1921.

RA A. BROWNE.

Witnesses:

Gnoncn S. Gum, Jnms H. Bmx..i

Certieate of Correction.

It is hereby certified that the assi ee in Letters Patent No. 1,495 066, Mey 20, 1924, upon the a. lication o Frank A. Browne, of Waynea ennsylveme, for an im rovement in acketed conduits, was erroneously described and speelied es e Berber Asphalt Pavn Company, whereas said assignee should have been described und specied as he Barber Asphalt Company as shown the records of assignments in this oce; and that the said Letters Patent shoul be read with this correion therein that the same may conform to the record of thecaseinthe Patent Signed and sealed ths'th day of August, A. D. 1924.

[man] WM. A. KINNAN,

Acting Commissioner of Patents. 

